/*
 * Copyright (c) 2011 Imre Fazekas.
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the Brillien nor the names of its
 * terms and concepts may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.vii.brillien.core.management.db;

import com.vii.brillien.core.component.SuperFlow;
import com.vii.brillien.core.management.BrillienServices;
import com.vii.brillien.ignition.BrillienContext;
import com.vii.brillien.kernel.BrillienException;
import com.vii.streamline.services.db.transaction.BrillienTransaction;
import org.apache.commons.dbcp.managed.DataSourceXAConnectionFactory;

import javax.transaction.RollbackException;
import javax.transaction.SystemException;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Level;

/**
 * Service class providing management functionality for Transactions in a Brillien appserver
 */
public class TransactionServices {

    private static BrillienTransactionManager                           transactionManager;

    private static ConcurrentHashMap<String, HashMap>                   datasoruces;
    private static ConcurrentHashMap<String, BrillienTransaction>       transactions;
    private static ConcurrentHashMap<com.vii.brillien.core.component.db.DataSource,
                                        DataSourceXAConnectionFactory>  connectionFactories;

    static{

        datasoruces         = new ConcurrentHashMap<String, HashMap>();
        transactionManager  = new BrillienTransactionManager();
        transactions        = new ConcurrentHashMap<String, BrillienTransaction>();
        connectionFactories = new ConcurrentHashMap<com.vii.brillien.core.component.db.DataSource, DataSourceXAConnectionFactory>();

    }

    public static void registerConnectionFactory( com.vii.brillien.core.component.db.DataSource ds, DataSourceXAConnectionFactory xaFactory ){
        connectionFactories.put( ds, xaFactory );
    }

    public static void unregisterConnectionFactory( com.vii.brillien.core.component.db.DataSource ds ){
        connectionFactories.remove( ds );        
    }

    public static void registerFlow( SuperFlow flow ){ String flowID = flow.getFlowID();
        if( !transactions.containsKey( flowID ) ){
            BrillienContext.systemLog( Level.FINE, "Registering transaction::" + flowID );
            transactions.put( flowID, transactionManager.getTransaction( flow ) );
            datasoruces.put( flowID, new HashMap<String, Connection>() );
        }
    }

    public static Connection getConnection( SuperFlow flow, String dataSourceName, boolean autocommit, int isolation ) throws BrillienException {
        String flowID = flow.getFlowID();
        registerFlow( flow );
        
        if( !datasoruces.get( flowID ).containsKey(dataSourceName) ){
            try{
                com.vii.brillien.core.component.db.DataSource ds = (com.vii.brillien.core.component.db.DataSource)BrillienServices.getPresenceByName( flow, dataSourceName );

                Connection c = ds.getConnection();
                c.setAutoCommit( autocommit );
                c.setTransactionIsolation( isolation );

                if( ds.isXaCapable() ){
                    transactions.get( flowID ).enlistResource(
                        connectionFactories.get( ds ).getTransactionRegistry().getXAResource( c )
                    );
                }
                else{
                    transactions.get( flowID ).enlistConnection( c );
                }

                datasoruces.get( flowID ).put(
                    dataSourceName, c
                );
                BrillienContext.systemLog( Level.FINE, "Connection created for Flow " + flowID + " by " + dataSourceName );
            } catch( SQLException e ){
                throw new BrillienException( e );
            } catch (SystemException e) {
                throw new BrillienException( e );
            } catch (RollbackException e) {
                throw new BrillienException( e );
            }
        }
        
        return (Connection)datasoruces.get( flowID ).get( dataSourceName );
    }

    public static void closeFlow( SuperFlow flow )  { String flowID = flow.getFlowID();
        BrillienContext.systemLog( Level.FINE, "Flow commiting::" + flowID );
        if( transactions.containsKey( flowID ) ){
            try {
                transactions.get( flowID ).commit();
            } catch (Exception e) {
                BrillienContext.exceptionLog( "FlowServices", "rollbackFlow rollback", e );
            }
            transactions.remove( flowID );
            datasoruces.remove( flowID );
        }
    }

    public static void rollbackFlow( SuperFlow flow ) { String flowID = flow.getFlowID();
        BrillienContext.systemLog( Level.FINE, "Flow rolling back::" + flowID );
        if( transactions.containsKey( flowID ) ){
            try {
                transactions.get( flowID ).rollback();
            } catch (Exception e) {
                BrillienContext.exceptionLog( "FlowServices", "rollbackFlow rollback", e );
            }
            transactions.remove( flowID );
            datasoruces.remove( flowID );
        }
    }
    

}
